JP4445640B2 - Manufacturing method of squeezed container - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of manufacturing a squeezed container, and more particularly to a method of squeezing a sheet mainly made of paper to form a squeezed container.
[0002]
[Prior art]
Synthetic resin molded containers are used as tray-like containers for storing various foods and the like for distribution. The molding container is molded into a shape that matches the recess of the mold by vacuum molding or pressure molding of a sheet-like resin material. Such a synthetic resin tray-like container is excellent in productivity and advantageous in terms of cost, but causes a problem in processing after use. In particular, incineration may generate harmful gases and damage the furnace.
[0003]
In view of such a problem, a squeezed container in which a sheet mainly made of paper is drawn and formed into a tray shape, for example, is used. This type of squeezed container is obtained by sandwiching a sheet-like material between a pair of molds.
[0004]
[Problems to be solved by the invention]
When drawing a base paper between a mold having a concave portion and a mold having a convex portion, the base paper has a portion that is locally stretched and a portion that is compressed. When the paper is stretched locally more than the breaking elongation of the base paper, the base paper is torn at that portion and causes damage. In addition, when it is compressed during drawing, a large number of wrinkles are generated inside the tray-like container, thereby deteriorating the appearance and resulting in a case lacking cosmetics. In some cases, the value of the product as a tray may be lost.
[0005]
Therefore, as shown in FIG. 10, a ruled line, that is, a streak-like bending process 2 is applied to the sheet-like base paper 1 in advance. When such a sheet 1 is drawn, the shape shown in FIGS. 11 and 12 is obtained. Here, by cutting and trimming the portion corresponding to the outer peripheral edge of the container 4 along the cutting line 3, the container 4 having the concave portion 5 as shown in FIG. 13 can be obtained. If the base paper 1 is subjected to the ruled line processing 2 in this way, the formability especially at the corner portion of the container 4 is improved.
[0006]
However, even in such a conventional squeezed container, when the crease formed by the ruled line processing 2 is squeezed along the gap between the pair of molds at the time of drawing, the resistance force caused by strong friction when the thickness of the crease is large Acts, and the resisting force prevents the mutual movement of the base paper 1 and the mold, which may damage the sheet 1.
[0007]
In addition, as shown in FIGS. 11 to 13, such a conventional squeezed container has a ruled line 2 on the upper surface of the finished container 4, particularly in a region from the flange to the peripheral edge of the recess 5 at the corner. Will remain, and the ruled line 2 will cause the appearance of the tray-like container 4 to be damaged, resulting in lack of cosmetics.
[0008]
The present invention has been made in view of such problems, and an object of the present invention is to provide a method of manufacturing a squeezed container that is easy to mold and does not leave wrinkles or ruled lines in the molded container. And
[0009]
[Means for Solving the Problems]
One invention of the present application is a method of forming a drawn container by drawing a sheet mainly made of paper,
The diaphragm with facilities to the borders working radially on the seat in a region outside the outer peripheral edge of the container, the production of draw-formed container, characterized by draw forming in a state not subjected to border working at the site to be the aperture container It is about the method.
[0010]
The ruled line processing may be performed at a position corresponding to a corner portion in the circumferential direction on the outer side of the outer peripheral edge of the drawn container formed here. Further, the sheet may be formed by drawing while the outer peripheral side portion of the sheet is pressed by the presser plate. In addition, a region on the outer peripheral side with respect to the middle portion of the ruled line processing region may be pressed by a pressing plate. The sheet may be a paperboard in which a resin film or an aluminum foil is laminated on at least one surface of the paper. The drawing may be performed in a state where the sheet contains 8 to 25% of water by weight. Further, drawing may be performed in a state of being heated at a temperature within a range of 50 to 150 ° C.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to an embodiment shown in the drawings. 1 to 4 show an apparatus used for drawing a drawn container according to an embodiment of the present invention, and this apparatus particularly includes an upper mold 11 and a lower mold as shown in FIG. A squeeze container is obtained by forming a side mold 12 and a presser plate 13 and drawing them so as to overlap each other.
[0012]
As shown in FIG. 1, a protrusion 17 is formed on the lower surface of the upper mold 11 at substantially the center thereof. Further, as shown in FIG. 2, the lower mold 12 is formed with a concave portion 18 that substantially matches the shape of the container at the substantially central portion thereof. On the other hand, as shown in FIG. 3, the presser plate 13 is composed of a frame having a relatively narrow width, and has an opening 19 at the center.
[0013]
Next, a state in which the squeezed container is formed by the upper and lower molds 11 and 12 and the presser plate 13 will be described. The base paper 23 used here may be a general base paper made of natural pulp or non-wood pulp. Alternatively, a base paper containing a fibrous resin may be used. Further, a sheet 23 made of such a natural paper, a non-wood pulp, or a base paper in which a resin film is joined to the surface of one side or both sides of a base paper containing a fibrous resin or an aluminum foil may be used.
[0014]
Further, as shown in FIG. 5, the base paper 23 is configured by a streak-like bent line at a position corresponding to the corner portion of the container 30 outside the region corresponding to the outer peripheral edge 35 of the container 30. A ruled line process 24 composed of ruled lines is applied. An end portion on the inner peripheral side of the ruled line in the ruled line processing 24 is made to substantially coincide with the outer peripheral edge of the container 30. Further, such ruled line processing 24 is formed so that the portion corresponding to the inner peripheral edge 20 of the opening 19 of the presser plate 13 intersects the intermediate position of the ruled line (see FIG. 6).
[0015]
In this way, the sheet-like base paper 23 that has been subjected to the ruled line processing 24 in advance has a moisture content in the range of 8 to 25% by weight, more preferably in the range of 13 to 20% by weight, and optimally around 15% by weight. Condition the moisture content within the range.
[0016]
Thus, the sheet | seat 23 adjusted to the appropriate moisture content is mounted on the upper surface of the lower metal mold | die 12 shown in FIG. Then, the peripheral edge of the sheet 23 is pressed by the pressing plate 13. At this time, the position of the inner peripheral edge of the opening 19 of the presser plate 13 intersects the intermediate position in the length direction of the ruled line processing 24 as indicated by a chain line 20 in FIG.
[0017]
And the sheet | seat 23 is heated in the range of 50-150 degreeC by the upper and lower metal mold | dies 11 and 12, More preferably, it exists in the range of 60-100 degreeC. In such a state, press molding is performed so that the protrusion 17 of the upper mold 11 is aligned with the recess 18 of the lower mold 12. As a result, as shown in FIGS. 6 and 7, the sheet 23 is drawn. Then, by trimming the sheet 23 at the cutting line 35 corresponding to the outer peripheral edge of the sheet 23 as described above, a drawn container 30 as shown in FIGS. 8 and 9 is obtained.
[0018]
Such a squeezed container 30 does not have a ruled line by the ruled line processing 24 in particular. That is, since the ruled line of the ruled line processing 24 is formed in a region outside the cutting line 35 constituting the outer peripheral edge of the container 30, when the sheet 23 is punched at the cutting line 35, the ruled line 24 is formed on the container 30 side. It does not remain. Accordingly, since there is no unevenness due to the ruled line 24 in the narrow gap between the protrusion 17 of the upper mold 11 and the recess 18 of the lower mold 12, the base paper of the corner portion of the container 30 at the time of drawing processing. The sliding between the sheet 23 and the molds 11 and 12 is hindered by the abnormal frictional force, and the paper is not damaged.
[0019]
As described above, according to the drawing method of the container 30 of the present embodiment, the ruled line processing 24 is performed on the sheet 23 on the outer peripheral side of the container 30 and corresponding to the corner before drawing. Therefore, the outer peripheral side portion of the sheet 23 subjected to the ruled line processing 24 is pressed by the pressing plate 13. Here, the portion pressed by the presser plate 13 is set at a position where the inner peripheral edge 20 of the opening 19 intersects the intermediate position in the length direction of the ruled line 24. In such a state, by performing drawing with the upper and lower molds 11 and 12, the drawn container 30 along the recess 18 of the lower mold 12 is obtained.
[0020]
In such a squeezed container 30, wrinkles are not generated in the container 30 due to the ruled line processing 24 formed in the part on the outer peripheral side of the sheet 23 and the part corresponding to the corner of the container 30. Therefore, a container having an excellent appearance and a cosmetic property can be obtained. Further, since the ruled line processing 24 is applied to the outside of the outer peripheral edge 35 of the container 30, the sheet 23 does not break particularly in the corner portion when the container 30 is formed, and the sheet 23 extends uniformly. This stabilizes the molding. Accordingly, the squeezed container 30 having excellent dimensional accuracy, good appearance, and cosmetics is provided.
[0021]
Here, as shown in FIG. 9, a flange 31 is formed on the outer peripheral side of the container 30, and a step portion 32 is formed on the inner peripheral side of the flange 31, and the inner side of the step portion 32 becomes a concave portion 33. Yes. Note that the squeeze container does not necessarily have such a flange 31 or stepped portion 32, and can be widely applied to squeeze containers of various shapes.
[0022]
【The invention's effect】
As described above, the main invention of the present application is a method of drawing a sheet mainly made of paper to form a drawn container. In the method of forming a drawn container, the sheet is radially creased in a region outside the outer peripheral edge of the drawn container. At the same time, it is drawn in a state in which no ruled line processing is applied to the portion to be the drawn container .
[0023]
Therefore, according to such a manufacturing method of the drawn container, since the sheet is radially creased particularly in the region outside the outer peripheral edge of the squeezed container, the squeezing of the corner portion by such crease forming is performed. Is performed stably. In addition, since the ruled line processing is not formed in the region inside the outer peripheral edge of the container, wrinkles do not occur in the product, and damage does not occur. Accordingly, a squeezed container having stable molding, excellent dimensional accuracy, and cosmetics can be obtained.
[0024]
In particular, the area pressed by the presser plate by pressing the outer peripheral part of the sheet with the presser plate and drawing at the same time as the area outside the middle part of the ruled line processing area is pressed by the presser plate The crease area in the area inside and outside the outer peripheral edge of the container is more easily extended, so that the molding is stabilized, the product does not wrinkle and does not break. Become.
[Brief description of the drawings]
FIG. 1 is a bottom view of an upper mold.
FIG. 2 is a plan view of a lower mold.
FIG. 3 is a plan view of a presser plate.
FIG. 4 is a longitudinal sectional view showing a state in which drawing is performed by combining upper and lower molds and a presser plate.
FIG. 5 is a plan view of a sheet for drawing.
FIG. 6 is a plan view of a drawn sheet.
FIG. 7 is an external perspective view of a drawn sheet.
FIG. 8 is an external perspective view of a formed squeeze container.
FIG. 9 is a front view in which a part of the squeezed container is broken.
FIG. 10 is a plan view of a sheet for performing conventional drawing.
FIG. 11 is a plan view showing a state in which the sheet has been drawn.
FIG. 12 is an external perspective view of the drawing sheet.
FIG. 13 is an external perspective view of a conventional container obtained by drawing.
[Explanation of symbols]
1 sheet (base paper)
2 Ruled line processing 3 Cutting line (outer edge)
4 Container 5 Recess 11 Mold (Upper side)
12 Mold (lower side)
13 Presser plate 17 Protrusion 18 Recess 19 Opening 20 Inner peripheral edge 23 Sheet (base paper)
24 Ruled Line 30 Container 31 Flange 32 Stepped Part 33 Concave 35 Outer Periphery (Cutting Line)

Claims (7)

In a method of forming a drawn container by drawing a sheet mainly made of paper,
The diaphragm with facilities to the borders working radially on the seat in a region outside the outer peripheral edge of the container, the production of draw-formed container, characterized by draw forming in a state not subjected to border working at the site to be the aperture container Method. 2. The method of manufacturing a squeezed container according to claim 1, wherein a ruled line is processed in a region outside the outer peripheral edge of the squeezed container to be molded and corresponding to a circumferential corner portion.   2. The method of manufacturing a squeezed container according to claim 1, wherein the outer peripheral side portion of the sheet is drawn while being pressed by a pressing plate.   4. The method of manufacturing a squeezed container according to claim 3, wherein a region on the outer peripheral side of the middle portion of the ruled line processing region is pressed by a presser plate. 2. The method for producing a squeezed container according to claim 1, wherein the sheet is a paperboard in which a resin film or an aluminum foil is laminated on at least one surface of the paper.   2. The method for producing a drawn container according to claim 1, wherein the drawing is performed in a state where the sheet contains 8 to 25% of water by weight.   2. The drawn container manufacturing method according to claim 1, wherein the drawing is performed in a state of being heated at a temperature within a range of 50 to 150 [deg.] C.

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